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Author Topic: Honda CM 400 Spark at only one plug  (Read 373 times)

Offline reichertripper

  • Posts: 1
Honda CM 400 Spark at only one plug
« on: Jun 04, 2017, 22:53:07 »
81 honda cm 400 only gets spark in one plug wire when the other plug wire is grounded to bike... both plugs wont fire. I dont understand it got any ideas??

Offline CGRAM

  • Posts: 11
Re: Honda CM 400 Spark at only one plug
« Reply #1 on: Jun 06, 2017, 20:25:41 »
81 honda cm 400 only gets spark in one plug wire when the other plug wire is grounded to bike... both plugs wont fire. I dont understand it got any ideas??
Sounds like the CDI box. Lots of time they test out good with a light but not give a spark.


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